Mining machine



May 17, 1932. P. ROOZEE MINING MACHINE Original Filed April 18, 1950 2 ShGSS-Shee May 17, 3932- P. Rom/ZEE 1558985 MINING MACHINE Original Filed April 18, 1930 2 Sheets-Sheet 2 Patented May 17., 1932 TieTTTan STATES PATENT @Trice PETER ROOZEE, OF CHICAGO, ILLINOIS, ASSIGNOR TO GOODMAN MANUFACTURING COlVI- PAN Y, F CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS MINING MACHINE Application filed April 18, 1930, Serial No. 445,480. Renewed Ju1y'27, 1931.-

This invention relates to improvements in mining' machines and more particularly to coal cutting machines mountedl on a wheeled truck, and ada table to be pivotally movable f with respect tiereto during the cutting operation.

The invention has among other objects to provide an improved means for mounting the truck axles whereby said axles may be l0 pivotally movable with, respect to the truck during the travelling operation, and fixed with respect to said truc-k during the cutting operation, so as to provide a three point suspension for the truck while moving about the mine to allow said truck to negotiate a rough mine track, and hold said truck in a fixed position with respect to the truck axles to prevent binding of the cutter bar while cutting.

rIhe invention may best be understood with reference to the accompanying drawings, wherein:

Figure 1 is a top plan view of a mining may chine constructed in accordance with my in- Lb vention;

Figure 2 is a side elevation of the mining machine shown in Figure 1 with cert-ain parts broken away and in section to more clearly illustrate my invention; and

Figure 3 is a partial fragmentary transverse sectional view taken on line 3-3 of Figure 1.

Referring now to the details shown in the drawings, I have shown my invention as ap? plied to a mining machine of the slabbing type adapted to cut a kerf adjacent the mine bottom or at various elevations with respect thereto which has as its principal elements a truck frame 10 supported by axles 12 and 0 13 having supporting wheels 141, 14 and 15, 15 respectively, and having a turntable 16 mounted thereon which turntable supports a forwardly extending cutting element 17.

The cutting element 17 is mounted on the turntable 16 so as to be pivotally movable about a horizontal axis and is similar to the cutting element shown in a prior patent application of William T. McCullough, Serial No. 344.616, iled March 6, 1929, so will only be described in so far as is necessary to fully disclose my present invention, and includes a cutter frame 18 having a cutter bar 19 depending therefrom and adjustable with respect thereto in suitable guides. kMeans are provided for adjusting the cutter bar 19 with respect to the cutter frame 18 but these means and other details of construction of the cutting element need not be described as they form no part of the present invention.

In carrying out my invention the front axle 12 is journaled in a bolster 20 fixed to the bottom portion of thetruck frame 10 and the rearward axle 13 is journaled in a bolster 21 which in the form shown is substantially hollow and extends the full length of the axle between the wheels 15.

Centrally of the bolster 21 is a pair of oppositely disposed longitudinally extending bearings 23 and 24 in which are mounted shafts 25 and 26 in alignment with each other. These shafts project outwardly beyond their respective bearings and are journaled in trunnions 27 and 28 extending downwardly and forming a part of the truck frame 10 of the machine so the axis of said shafts coincides with the longitudinal central axis of the machine. By means of the trunnion support just described it will be seen that the entire axle 13 may be tilted with respect to the truck frame and that the truck frame is supported on three points which comprise the front supporting wheels 14, 14 and shafts 25 and 26. Tli'us the rearward wheels 15 are allowed to move vertically about the axis of the shafts and 26 to compensate for a rough or uneven mine track.

Integral with the bolster 21 is a projecting arm 30 herein extending forwardly and outwardly and having at its forward end a forked portion 31. Each prong of the forked portion 31 has a horizontal slot 32 formed therein.

A socket member 33 is supported within the forked portion 31 of the arm 30 on oppositely extending oval shaped pins 34E, which pins fit in the slots 32, 32. A vertical shaft- 35 fits in the socket member 33 and has a shoulder 36 thereon which abuts the top portion of said socket member. A nut 37 is threaded on the lower portion of said shaft which nut abuts the bottom portion of the socket member 33.

'Ihe vertical shaft 35 extends upwardly above the truck frame 10 through a sleeve 38 fixed in said truck frame. The sleeve 38 is provided with a iiange 39 on its lower end which abuts the under side of the truck frame 10. A compression spring 40 fits on the vertical shaft 35 and is interposed between the iiange 39 and the top portion of the socket member 33. A nut 41 is threaded on the sleeve 38 and abuts the top portion of the truck frame l0 to hold said sleeve in position on said truck frame.

An oblong slot 42 having its longest dimension extending vertically is provided in the vertical shaft 35, while corresponding aligned oblong slots 43 and 44 are provided in opposite sides of the sleeve 38 in alignment with the slot 42. A wedge pin 45 is adapted to be inserted within the slots 43, 42 and 44 to hold the shaft 35 from movement in the sleeve 38, and thus hold the bolster 2l and rear axle 13 from movement about the axis of the shafts 25 and 26.

It may thus he seen that a means has been provided which permits the mining machine truck axles and wheels to have a certain flexibility of movement when travelling about the mine rails and holds the truck frame from movement when it is desired to cut a kerf in the mine wall, and that this means is controlled from the top portion of the truck frame 10. Thus a simple and eiiicient means has been provided to hold the truck frame from movement with respect to the axles which comprises the wedge pin 45 which may be inserted within the aligned slots 43, 42 and 44 to hold the shaft 35, projecting arm 30 and axle 13 from movement with respect to the truck frame and removed from said aligned slots when it is desired that the axle 13 be allowed to move about a longitudinal axis with respect to the truck frame l0 about the longitudinal axis of said truck frame. This allows the mining machine to travel over relatively rough tracks and holds the mining machine in a stationary position when cutting which prevents binding of the cutter bar and heating of the motor and cutter driving mechanisms and insures the cutting of a uniform lierf parallel to the mine bottom.

Although I have shown and described one form in which my invention may be embodied, it will be understood that the arrangement of the various parts and the construction thereof may be altered or changed without departing from the spirit and scope of the invention Furthermore, I do not wish to be construed as limiting myself to the specific embodiment illustrated, excepting as it may be limited by the appended claims.

I claim as my invention:

1. In a mining machine, a truck frame, a turntable thereon, a forwardly projecting cutting element supported on said turntable,

means for supporting said trucl; frame for movement about a mine comprising a iioating axle, and means for selectively holding said axle in a fixed relation with respect to said truck frame or allowing said axle to move with respect to said truck frame controlled from above said truck frame.

2. In a mining machine, a truck frame, a turntable thereon, a forwardly projecting cutting element supported on said turntable, means for supporting said truck rame for movement about a mine comprising a floating` axle, and means for selectively holding said axle in a fixed relation with respect to said truck frame or allowing said axle to move with respect to said truck frame comprising a detachable wedge pin above said truck frame connectible with said axle.

3. In a mining machine, a truck frame, a turntable thereon, a forwardly projecting cutting element supported on said turntable, means for supporting said truck frame for movement about a mine comprising a floating axle, and means for selectively holding said axle in a fixed relation with respect to said truck frame or allowing said axle to move with respect to said truck frame comprising a shaft having connection with said axle on the under portion of said truck frame and a detachable wedge pin having connection with said shaft above said truck frame.

4. In a mining machine, a truck frame, a turntable thereon, a forwardly projecting cutting element supported on said turntable, means for supporting said truck frame for movement about a mine comprising a floating axle, and means for selectively holding said axle in a lixed relation with respect to said truck frame or allowing said axle to move with respect to said truck frame comprising a sleeve having fixed connection with said truck frame, a shaft vertically movable within said sleeve, means for connecting said shaft with said axle on the under portion of said truck frame and detachable means above said truck frame for fixing said shaft from movement with respect to said sleeve.

5. In a mining machine, a truck frame, a turntable thereon, a forwardly projecting cutting element supported on said turntable, means for supporting said truck frame for movement about a mine comprising a iioating axle, and means for selectively holding said axle in a fixed relation with respect to said truck frame or allowing said axle to move with respect to said truck frame comprising a sleeve having fixed connection with said truck frame, a shaft vertically movable within said sleeve, means for connecting said shaft with said axle on the underportion of said truck frame and detachable means above said truck frame for fixing said shaft from movement with respect to said sleeve comprising a wedge pin for selectively connect-- ing said shaft with said sleeve.

CTL

6. In a mining machine, a truck frame, a turntable thereon, a forwardly projecting cutting element supported on said turntable, means for supporting said truck frame for movement about a mine comprising an axle mounted on the underportion of said truck frame for pivotal movement with respect thereto about a longitudinal axisdisposed centrally of said truck frame, and means vfor selectively holding said axle in a fixed relation with respect to said truck frame or allowing said axle to move about said longitudinal axis with respect to said truck frame comprising a shaft having connection with said axle on the under portion of said truck frame, and means operated from above said truck frame for holding said shaft from movement with respect to said truck frame or allowing said shaft to move with respect to said truck frame.

7. In a mining machine, a truck frame, a turntable thereon, a forwardly projecting cutting element supported on said turntable, means for supporting said truck frame for F movement about a mine comprising an axle mounted on the underportion of said truck frame for pivotal movement with respect thereto about a longitudinal axis disposed centrally of said truck frame, and means for selectively holding said axle in a fixed relation with'respect to said truck frame or allowing said axle to move about said longitudinal axis with respect to said truck frame, comprising a shaft having connection with said axle on the under portion of said truck frame, and means operated from above said truck frame for holding said shaft from movement with respect to said truck frame or allowing said shaft to move with respect to said truck frame comprising a detachable wedge pin having connection with said` shaft and said truck frame.

8. In a mining machine, a truck frame, a turntable thereon, a forwardly projecting cutting element supported on said turntab-le, means for supporting said truck frame for movement about a mine comprising an axle mounted on the underportion of said tru-ck frame for pivotal movement with respect thereto about a longitudinal axis disposed centrally of said truck frame, and means for selectively holding said axle in a fixed relation with respect to said truck frame or allowing said axle to move about said longitudinal axis with respect to said truck frame comprising a sleeve having fixed connection with said truck frame, a shaft movable with in said sleeve, means for connecting' said shaft with said axle on the 'underportion of said truck frame, and detachable means on 'the top portion of said truck frame for fixing said shaft from movement with respect to said' sleeve comprising a wedge pin for selectively connecting said shaft with said sleeve.

9. In a mining machine, a truck frame, a

turntable, a cutting element supported on said turntable for cutting a kerf at various elevations with respect to the mine bottom, and means for supporting said truck frame and mining machine for movement about a mine comprising an axle having wheels thereon fixed to the underportion of said truck frame, another axle having wheels thereon mounted ron the under portion of said truck I frame for pivotal movement with respect thereto about a longitudinal axis, and means for holding Vsaid last mentioned axle in a fixed relation with respect to said truck frame or allowing said axle to move about a longitudinal axis with respect to said truck frame.

l0. In a mining machine, a truck frame, a turntable, a cutting element supported on said turntable for cutting a kerf at various elevations with respect to the mine bottom, and means for supporting said truck frame and mining machine for movement about a mine comprising an axle having wheels thereon fixed to the ,under portion of said truck frame, another axle having wheels thereon mounted on the under portion of said truck frame for pivotal movement with respectthereto about a longitudinal axis, means for holding said last mentioned axle in a fixed relation with respect to said truck frame or allowing said axle to move about a longitudinal axis with respect to said tru-ck frame comprising a projecting arm connected with said axle, and means for holding said arm from movement with respect to said truck frame.

ll. In a mining machine, a truck frame, a turntable, a cutting element supported on said turntable for cutting a kei-f at various elevations with respect to the mine bottom, and means for supporting said truck and mining machine for movement about amine comprising an axle having wheels thereon fixed to the under portion of said truck frame, another axle having wheels thereon mounted on the under portion of said truck frame for pivotal movement with respect thereto about a' longitudinal axis, and means for holding said last mentioned axle in a fixed relation with respect to said truck frame or allowing said axle to move about a longitudinal axis with respect to said truck frame comprising a projecting arm connected with said axle, a vertical shaft connected with said arm and slidably movable with respect to said trucl; frame, .and means for holding said shaft `from movement with respect to said truck frame or allowing said shaft to move with respect to said truck frame.

1:2. In a mining machine, a truck frame, a turntable, a cutting element supported on said turntable for cutting a lierf at various elevations with respect to the mine bottom, and means for supporting said truck frame and mining machine for movement about a mine comprising an axle having wheels thereon fixed tov the under portion of said truck frame, another axle having Wheels thereon mounted on the underportion of said truck frame for pivotal movement With respect n thereto about a longitudinal axis, and means for holding said last mentioned axle in a lixed relation with respect to said truck frame or allowing said axle to move about a longitudinal axis with respect to said truck frame comprising a projecting arm connected with said axle for movement therewith about said longitudinal axis, a vertical shaft slidably movable with respect to said truck frame and having connection with said arm, and detachable means operable from the top portion of said truck for holding said vertical shaft from movement with respect to said truck frame.

13. In a mining machine, a truck frame, a turntable, a cutting element supported on said turntable for cutting a. lrerf at various elevations with respect to the mine bottom, and means for supporting said truck frame and mining machine for movement about a mine comprising an axle having wheels thereon fixed to the under portion of said truck frame, another axle having` wheels thereon mounted on the underportion of said truck frame for pivotal movement with respect thereto about a longitudinal axis, and means for holding said last mentioned axle in a fixed relation with respect to said truck frame or allowing said axle to move about said longitudinal axis with respect to said truck frame comprising a projecting arm connected with said axle for movement therewith about said longitudinal axis, a sleeve having fixed connection with said truck frame, a shaft vertically movable within said sleeve, and detachable means operable from the top portion of said truck for fixing said shaft from movement with respect to said sleeve.

14. In a mining machine, a truck frame, a turntable, a cutting element supported on said turntable for cutting a kerf at various elevations with respect to the mine bottom, and means for supporting said truck frame and mining machine for movement about a mine comprising an axle having wheels thereon fixed to the under portion of said truck frame. another axle having wheels thereon mounted on the underportion of said truck frame for pivotal movement with respect thereto about a longitudinal axis, and means for holding said last mentioned axle in a lixed relation with respect to said truck frame or allowing said axle to move about a longitudinal axis with respect to said truck frame comprising a projecting arm connected with said axle for movement therewith about said longitudinal axis, a sleeve having fixed connection with said truck frame, a shaft vertically movable within said sleeve, and detachable means operable from the top portion of said truck frame for fixing said shaft from movement with respect to said sleeve comprising a wedge pin lixedly connecting said shaft with said sleeve.

15. In a mining machine, a truck frame, a turntable, a cutting element supported on said turntable for cutting a kerf at various elevations with respect to the mine bottom, and means for supporting said truck frame and mining machine for movement about a mine comprising an axle having wheels thereon fixed to the under portion of said truck frame, another axle having wheels thereon mounted on the underportion of said truck frame for pivotal movement'with respect thereto about a longitudinal axis, and means for holding said last mentioned axle in a fixed relation with respect to said truck frame or allowing said axle to move about a longitudinal axis with respect to said truck frame comprising a projecting arm connected with said axle for movement therewith about said longitudinal axis, a sleeve having fixed connection with said truck frame, a. shaft vertically movable within said sleeve, and detachable means operable from the top portion of said truck frame for fixing said shaft from movement with respect to said sleeve comprising a wedge pin insert-able through aligned apertures in said sleeve and shaft.

16. ln a mining machine, a truck frame, a turntable on said truck frame, a forwardly projecting cutting element supported on said turntable for cutting a kerf at various elevations with respect to the mine bottom, means for supporting said truck frame and mining machine for movement about a mine comprising an axle fixed to the under portion of said truck frame having wheels theron, a bolster trunnioned on the longitudinal central axis of said truck frame to pivot about said axis, an axle carried by said bolster having wheels on the opposite ends thereof, and means for allowing said bolster and axle to freely move about said longitudinal central axis of said truck frame when travelling about a mine, and hold said axle and bolster in a stationary position with respect to said truck frame when cutting comprising a projecting arm and detachable means operable from the top portion of said truclr frame for holding said arm from movement or allowing said arm to move with respect to said truck frame.

17. ln a mining machine, a truck frame, a turntable on said truck frame, a forwardly projecting cutting element supported on said turntable for cutting a lrerf at various elevations with respect to the mine bottom, means for supporting said truck frame and mining machine for movement about a mine comprising an axle fixed to the under portion of said truck frame having Wheels thereon. bolster trunnioned on the longitudinal central axis of said truck frame to pivot about said axis, an axle carried by said bolster having wheels on the opposite ends thereof, and means for allowing said bolster and axle to freely move about said longitudinal central axis of said truck frame when travelling about a mine or hold said axle and bolster in a stationary position with respect to said truck frame when cutting comprising a proj ecting arm having connection with said bolster, a vertical shaft connected with said arm and slidably movable with respect to said truck frame, and detachable means operable from the top portion of said truck frame for holding said shaft from movement with respect to said truck frame.

18. In a. mining machine, a truck frame, a turntable on said truck frame, a forwardly projecting cutting element supported on said turntable for cutting a kerf at various elevations with respect to the mine bottom, means for supporting said truck frame and mining machine for movement about a mine comprising an axle fixed to the under portion of sald truck frame having wheels thereon, a bolster trunnioned on the longitudinal central axis of said truck frame to pivot about said axis, an axle carried by said bolster having wheels on the opposite ends thereof, and means for allowing said bolster and axle to freely move about said longitudinal central axis of said truck frame when travelling about a mine or hold said axle and bolster in a stationary position with respect to said truck frame when cutting comprising a projecting arm connected with said bolster for movement therewith about said longitudinal axis, a sleeve having fixed connection with said truck frame, a shaft vertically movable within said sleeve, and detachable means for fixing said shaft from movement with respect to said sleeve.

19. In a mining machine, a truck frame, a turntable on said truck frame, a forwardly projecting cutting element supported von said turntable for cutting a lierf at various elevations with respect to the mine bottom, means for supporting said truck frame and mining machine for'movement about a mine comprising an axle fixed to the under portion of said truck frame having wheels thereon, a bolster trunnioned on the longitudinal central axis of said truck frame to pivot about said axis, an axle carried by said bolster having wheels on the opposite ends thereof, and means for allowing said bolster and axle to freely move about said longitudinal central axis of said truck frame when travelling about a mine or hold said axle and bolster in a stationary position with respect to said truck frame when cutting comprising a projecting arm connected with said bolster for movement therewith about said longitudinal axis, a sleeve having fixed connection with said truck frame, a shaft vertically movable within said sleeve, and detachable means for fixing said shaft from movement` with .respect to said sleeve comprising a'detachable wedge pin fixedly connecting said shaft with said sleeve.

20. In a mining machine, a truck frame, a turntable on said truck frame, a forwardly projecting cutting element supported on said turntable for cutting a kerf at various elevations with respect to the mine bottom, means for supporting said truck frame and mining machine for movement about a mine comprising an axle fixed to the under portion of said truck frame having wheels thereon, abolster trunnioned on the longitudinal central axis of said truck frame to pivot about said axis, an axle carried by said bolster having wheels on the opposite ends thereof, and means for allowing said bolster and axle to freely move about said longitudinal central axis of said truck frame when travelling about a mine or hold said axle and bolster in a stationary position with respect to said truck frame when cutting comprising a projecting arm connected with said bolster for movement therewith about said longitudinal axis, a sleeve having fixed connect-ion with said truck frame, a shaft vertically movable within said sleeve, and detachable means for fixing said shaft from movement with respect to said sleeve comprising a detachable wedge pin insertable through aligned apertures in said sleeve and shaft.

21. In a mining machine, a truck frame,

a cutting element supported on said truck frame having a cutter bar Aextending forwardly therefrom for cutting a kerf in the mine wall, means for supplying said truck frame for movement about a mine comprising a plurality of axles having wheels thereon, one of said axles yieldably supporting said truck frame for movement with respect t0 said axle, and means for holding said truck frame in fixed relation with respect to said axle or allowing said truck frame to move with respect to said axle. 22. In a mining machine, a truck frame, a cutting element supported on said truck frame having a cutter bar extending forwardly therefrom for Vcutting a kerf in the mine wall, means for supporting said truck frame for movement about a mine comprising a plurality ofaxles having wheels thereon, one of said axles yieldably supporting said truck frame for movement with respect to 'said axle, and means for holding said truck frame in `xed relation with respect to said axle or allowing said truck frame to move with respect to said axle comprising a projecting arm connected with said axle and means for holding said arm from movement with respect to said truck frame.

23. In a mining machine, a truck frame, a cutting element supported on said truck frame having a` cutter bar extending forwardly therefrom for cutting-a kerf in the mine wall, means for supporting said truck frame for movement about a mine comprising a plurality of axles having wheels thereon, one of said axles yieldably supporting said truck` frame for movement with respect to said axle, and means for holding said truck frame in iixed relation with respect to said axle or allowing said truclf` frame to move with respect to said axle comprising a detachable wedge pin connectible with said axle and truck frame.

24. In a mining machine, a truck frame, a cutting element supported on said truck frame having a cutter bar extending forwardly therefrom for cutting a kerf in the mine wall, means for supporting said truck frame for movement about a mine comprising a plurality of axles having wheels thereon, one of said axles yieldably supporting said truck frame for movement with respect to said axle, and means for holding said truck frame in lixed relation with r-espect to said axle or allowing said truck frame to move with respect to said axle comprising` a projecting arm connected with said axle and means for holding said arm from movement with respect to said truck frame comprising a detachable wedge pin connectible with said projecting arm and truck frame.

25. In a mining machine, atruck frame, a cutting element supported on said truck frame having a cutter bar extending forwardly therefrom for cutting a lerf in the mine wall, means for supporting said truclrframe for movement about a mine comprising a plurality of axles having wheels thereon, one of said axles yieldably supporting said truck frame for movement with respect to said axle, and means controlled from above said truck frame for holding said truck frame in fixed relation with respect to said axle or allowingsaid truck frame to move with respect to said axle. y y

26. In a mining machine, a truck frame, a cutting element supported on said truck frame having a cutter bar extending forwardly therefrom for cutting a kerf in the mine wall., means for supporting said truck frame for movement about a mine comprising a plural-ity of axles having wheels thereon, one of said axles yieldably supporting said truck frame for movement with respect to said axle, and means for holding said truck frame in fixed relation with respect to said axle or allowing said truck frame to move with respect to said axle comprising detachable means connectible with said truck frame and axle.

27. In a mining machine, a truck frame, a cutting element supported on said truck frame having a cutter bar extending forwardly therefrom for cutting a kerf in the mine wall, means for supporting said truck frame for movement about a mine comprising a plurality of axles having wheels thereon, one of said axles yieldably supporting'said truck frame for movement with respect to said axle, and means for holding said truck frame in fixed relation with'respect to said axle or allowing said truck frame to move with respect to said axle comprising detachable means disposed above said truck frame connectible with said axle.

28. In a mining machine, a truck frame, a cutting element supported on said truck frame having a cutter bar extending forwardly therefrom for cutting a kerf in the mine wall, means for supporting said truck frame for movement about a mine comprising a plurality of axles having wheels thereon, one of said axles yieldably supporting said truck frame for movement with respect to said axle, and means controlled from above said struck frame for holding said truck frame in fixed relation with respect to said axle or allowing said truck frame to move with respect to said axle comprising a detachable wedge pin having connection with said truck frame and axle.

29. In a mining machine, a truck frame, a cutting element supported on said truck frame having a cutter bar extending forwardly therefrom for cutting a korf in the mine wall, means for supporting said truck frame for movement about a mine comprising a plurality of axles having wheels thereon, one of said axles yieldably supporting said truck frame for movement with respect to said axle, and means controlled from above said truck frame for holding said truck frame in fixed relation with respect to said axle or allowing said truck frame to move with respect to said axle comprising a. projecting arm connected with said axle and a detachable wedge pin connectible with said projecting arm and truck frame.

30. In a mining machine, a truck frame, a cutting element supported on said truck frame having a vcutter bar extending forwardly therefrom for cutting a kerf in the mine wall, means for supporting said truck frame for movement about a mine comprising a plurality of axles having wheels thereon, one of said axles yieldably supporting said truck frame for movement with respect to said axle, and means controlled from above said truck frame for holding said truck frame in fixed relation with respect to said axle or allowing said truck frame to move with respect to said axle comprisingaprojecting arm connected with said axle and a detachable wedge pin disposed above said truck frame connectible with said projecting arm and truck frame.

3l. In a mining machine, a truck frame, a forwardly projecting cutting element supported on said truck frame, means for supporting said truck frame for movement about a mine comprising a floating axle, and means for selectively holding said axle in a fixed relation with respect to said truck frame or allowing said axle to move with respect to said truck frame.

32. In a mining machine, a truck frame, a forwardly projecting cutting element supported on said truck frame, means for supporting said truck frame for movement about a mine comprising a ioating axle, and means for selectively holding said axle in a fixed relation with respect to said truck frame or allowing said axle to move with respect to said truck frame comprising a detachable wedge pin connectible with said axle.

83. In a mining machine, a truck frame, a forwardly projecting cutting element supported on said truck frame, means for supporting said truck frame for movement about a mine comprising a fioating axle, and means for selectiveljT holding said axle in a fixed relation with respect to said truck frame or allowing said axle to move with respect to said truck frame comprising a shaft having connection with said axle on the underportion of said truck frame and a detachable wedge pin having connection with said shaft.

34. In a mining machine, a truck frame, a forwardly projecting cutting element supported on said truck frame, means for` supporting said truck frame for movement about a mine comprising a oating axle, and means for selectively holding said axle in a fixed relation with respect to said truck frame or allowing said axle to move-with 'respect to said truck frame comprising a sleeve having fixed Connection with said truck frame, a shaft vertically movable within said sleeve, means for connecting said shaft with said axle on the under portion of said truck frame and detachable means for fixing said shaft from movement with respect to said sleeve.

35. In a mining machine, a truck frame, a forwardly projecting cutting element supported on said truck frame, means for sup porting said truck frame for movement about a mine comprising a floating axle, and means for selectively holding said axle in a fixed relation with respect to said truck frame or allowing said axle to move with respect to said truck frame comprising a sleeve having fixed connection with said truck frame, a shaft vertically movable within said sleeve, means for connecting said shaft with said axle on the underportion of said truck frame and detachable means for fixing said shaft from movement with respect to said sleeve comprising a wedge pin for selectively connecting said shaft with said sleeve.

Signed at Chicago, in the county of Cook and State of Illinois, this sixteenth day of April, 1930.

PETER ROOZEE.

CERTIFICATE OF CORRECTION.

Patent No. 1,858,865. May 17, 1932.

PETER ROOZEE.

It is hereby certified that error appears in the printed specification of the as follows: Page 5, line 100, claim above numbered patent requiring correction 2l, for "supplying" read supporting; page 6, line 81, claim 28, for "struck" read truck; and that the said Letters Patent should be read with these corrections therein that the same may conform tothe record of the casein the Patent Office.

Signed and sealed this 6th day of September, A. D. 1932.

M. J. Moore,

(Seal) Acting Commissioner of Patents. 

